---
title: MIDISysExProc
framework: audiotoolbox
role: symbol
role_heading: Instance Property
path: audiotoolbox/audiooutputunitmidicallbacks/midisysexproc
---

# MIDISysExProc

## Declaration

```swift
var MIDISysExProc: (UnsafeMutableRawPointer?, UnsafePointer<UInt8>, UInt32) -> Void
```